RIX Industries MAN-2PS2B-N2 Page 20
7.11 Connecting Rod Bearings
The connecting rod is aluminum, with a closed eye at the upper (larger) and lower ends (smaller).
The smaller closed eye houses a needle bearing that fits around the wrist pin. The larger closed eye
houses a ball bearing that fits around the crankshaft. These bearing are supplied with RIX grease
packed for life with Polyurea (RIX P/N 45-110) grease and should be routinely inspected every
2000 hours maximum. Note: it is critical to use this high-load, high temperature grease for the
connecting rod bearings. Bearing life will be significantly shortened if this grease is not used and
may result in rod breakage or other significant damage. Caution: This grease is non-oxygen
compatible and must not come into contact with any gas wetted surfaces within the assembly, i.e.,
compression rings, lingers, piping, fittings, etc.
To replace the Connecting Rod Bearings:
1. Remove the piston assembly per Section 7.7.
2. With a pair of snap ring pliers, remove the snap rings from the wrist pin grooves.
3. Remove the wrist pin by pushing it through the needle bearing from one side of the piston
to the other, which may require a press. The piston may also require heating to allow the
wrist pin to be removed.
4. Remove the connecting rod from the piston assembly.
5. Remove the retaining plate from the ball bearing (larger closed eye).
6. Press the needle bearing out of the small end of the connecting rod (smaller closed eye).
7. Note: the large end connecting rod ball bearing was installed with a shrink-fit. Therefore, to
remove the ball bearing, the assembly should first be heated to 300° F and pressed lightly.
This will allow the ball bearing to slide out of its housing.
8. To install a new ball bearing, first heat the connecting rod to 300° F. Once heated, lay the
large end of the connecting rod on a flat surface, then slide the ball bearing into the bore and
allow to cool for final fitment.
9. Pack ball bearing full of RIX P/N 45-110 grease and reinstall the retaining plate.
10. To install a new needle bearing, first assure the bearing is packed with RIX PN 45-110
grease, then press into the small end of the connecting rod. Note: Be sure to press the
stamped end of the bearing (with identification markings).
11. Assemble the connecting rod into the piston assembly by pushing the wrist pin through the
bore in the rod, through the needle bearing and then back through the other side of the bore
in the rod.
12. Reinstall snap rings into their grooves.
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